Borussia Mönchengladbach have joined Celtic and Feyenoord in pursuing Hertha...

https://astro-wiki.win/index.php/What_Does_%E2%80%98Activate_a_Release_Clause%E2%80%99_Mean_in_Football_Transfers%3F

Borussia Mönchengladbach have joined Celtic and Feyenoord in pursuing Hertha BSC goalkeeper Tjark Ernst, according to Bild. Ernst’s contract includes a €5 million release clause, making him an attractive option for clubs seeking a reliable shot-stopper